"Putrisia Hendra " <putrisiazahra@gmail.com> wrote in message <i3anpt$ocd$1@fred.mathworks.com>...> hi guys..> actually i just want to ask you about AVGPOWER in Matlab..> this function tell us about average power a signal.> so, if we want to use that function in GUI how we can do that? i mean what should we d first?> i have some code:> > % compute the power spectrum, telling the FFT to use length(x) as the number of> %points in the FFT, and to use the sampling frequency 256Hz.> [P,f] = periodogram(x2,[],length(x2),256);> %the function returns a vector of frequencies at which the FFT was computed, f,> %and the power at each frequency, P.> > > temp_1((1:15386),1)=P;> temp_1((1:15386),2)=f;> delta=[temp_1((1:8),1) temp_1((1:8),2)];> theta=[temp_1((9:16),1) temp_1((9:16),2)];> alpha=[temp_1((17:24),1) temp_1((17:24),2)];> beta=[temp_1((25:40),1) temp_1((25:40),2)];> delta=sortrows(delta);> alpha=sortrows(alpha);> beta=sortrows(beta);> theta=sortrows(theta);> > d=avgpower(delta)> > set(handles.delta,'String',d)> guidata(hObject,handles)> > avgpower is dosnt work here..> > are there any solution bout my code?